Here is a utility method to export a given Collection to a Listbox column:

// ---------------------------------------------------------------------- // Name: EXPORT_COLLECTION_TO_LB_COL // Description: Method will take a collection and export to a Listbox // column Object type. // // Parameters: // $1 (COLLECTION) - Collection to export // $2 (POINTER) - Pointer Listbox column to export // ---------------------------------------------------------------------- C_COLLECTION($1;$col) C_POINTER($2;$lbCol) C_LONGINT($i;$type;$noSetObj) C_OBJECT($obj) If (Count parameters=2)   $col:=$1   $lbCol:=$2   CLEAR VARIABLE($lbCol->)   If (Type($lbCol->)=Object array)     For ($i;0;$col.length-1)       $type:=Value type($col[$i])       $noSetObj:=0       Case of         : ($type=Is text)           OB SET($obj;"valueType";"text";"value";$col[$i])         : ($type=Is integer)           OB SET($obj;"valueType";"integer";"value";$col[$i])         : ($type=Is boolean)           OB SET($obj;"valueType";"boolean";"value";$col[$i])         : ($type=Is real)           OB SET($obj;"valueType";"real";"value";$col[$i])         : ($type=Is float)           OB SET($obj;"valueType";"real";"value";$col[$i])         : ($type=Is date)           OB SET($obj;"valueType";"date";"value";String(Date($col[$i])))         : ($type=Is time)           OB SET($obj;"valueType";"time";"value";String(Time($col[$i])))         : ($type=Is object)           OB SET($obj;"valueType";"text";"value";JSON Stringify($col[$i]))         Else           $noSetObj:=1       End case       APPEND TO ARRAY($lbCol->;$obj)       CLEAR VARIABLE($obj)      End for     End if End if

Here is an example of using the method:

C_COLLECTION($col) C_OBJECT($obj) OB SET($obj1;"prop";"123") $col:=New collection("Text";254154;3.1416;Current date;false;$obj) EXPORT_COLLECTION_TO_LB_COL($col;->Column1)

Here is a array based Listbox with a column that is an object array type: